Could it be the 1024 week rollover issue? I have a Garmin aviation unit from early 90's(?), after the GPS system went from week 1024 to week 1 it wouldn't lock ( Saturday, 21st August 1999 ). Emailed them and had to do a hard rest, then let it sit outside for 30 min or so. You may have to open it up and remove a battery? Wouldn't hurt to contact them.
73 de Kriss KA1GJU-X X=INT(9)
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